单项选择题

This passage implies that_____.

A．horizontal faults are more dangerous than vertical faults
B．Vertical faults are more dangerous than horizontal faults
C．Earthquakes occur only around fault areas
D．California will break into pieces by an eventual earthquake

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单项选择题

This passage is mainly about_____.

A．the New Madrid fault in Missouri
B．the San Andreas and the New Madrid faults
C．the causes of faults
D．current scientific knowledge about faults

单项选择题

The main idea of the article is about_____.

A．defense planning after the Cold War
B．defense planners' problems
C．small conflicts in the world
D．potential warfare